             nil (fourth '(1 2 3)))))
 
 (deftest test-fourth-not-NPE
-    "Check the function zg.utils/fourth."
-    (testing "the function zg.utils/fourth."
+  "Check the function zg.utils/fourth."
+  (testing "the function zg.utils/fourth."
         (are [x y] (= x y)
             nil (fourth nil))))
 
 (deftest test-substring-1
-    "Check the function zg.utils/substring."
-    (testing "the function zg.utils/substring."
+  "Check the function zg.utils/substring."
+  (testing "the function zg.utils/substring."
         (are [x y] (= x y)
             "H"      (substring "Hello world!" 0 1)
             "He"     (substring "Hello world!" 0 2)

            "bcb" (replaceAll "aca" "a" "b"))))

(deftest test-replaceAll-2
    "Check the function zg.utils/replaceAll."
    (testing "the function zg.utils/replaceAll."
        (are [x y] (= x y)
            "b"     (replaceAll "aa" "aa" "b")
            "bb"    (replaceAll "aaaa" "aa" "b")

            "Hello " (substring "Hello world!" 0 6))))

(deftest test-substring-2
  "Check the function zg.utils/substring."
  (testing "the function zg.utils/substring."
        (are [x y] (= x y)
            "w"      (substring "Hello world!" 6 7)
            "wo"     (substring "Hello world!" 6 8)
